Fixed type: cultivar it needs to use the cultivar_id_query, not the site_id_query.
Gave non-submit buttons type "button" so clicking "Back" or "Show" in
object creation or edit forms doesn't create a new record or update an
exisiting one.  Also added a new test for this for the PFT case.
Fixes Redmine Bug #1784.
fix to enable clone of pft (redmine #2020)

removed cloner since it is only used by pfts
clone oft and add species/priors back to clone
Merge branch 'RM-2020-clone-pfts-broken' of https://github.com/PecanProject/bety

This restores the ability to clone PFTs which broke with commit e1f1087.